Docs: update moc documentation
Docs: update moc documentation

moc can now handle macros for base class, signal, slots and signal/slot
arguments.
Remove macros from section of known limitations.

Change-Id: If0a35851741673bf52b8cb5125aa36f396bc58fc
Reviewed-by: Jerome Pasion <c10995d24f6b454503389e8d00d837aef038985d@digia.com>
Reviewed-by: Paul Olav Tvete <97541fb6312d77f06e19078c7c70b2c1f75fb828@digia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc